...because it's the only feature you can actually erase and recreate to your specifications...?<br /><br />Trust me, if folks could remove other features, we'd see a ton of cartoon faces.<br /><br /><br />Ignore my avatar. ;)

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Once upon a time, I thought about doing just that, lol... My eyebrows grow into two sections (you can't tell by looking, but if I smooth my eyebrow up, I see the separation) and I assume other women shave theirs off so they don't have to worry about crooked eyebrows, or getting them shaped by a professional.